Cleaning and DecontaminationReturn-To-Work Preparedness

Dikeledi O. MatukaNational Health Laboratory Services

National Institute for Occupational Health

PO Box 4788, Johannesburg, 2000, RSA

Practice No.: 5200296

Switchboard: + 27 (0) 11 712 6400

Website: http://www.nhls.ac.za

http://www.nioh.ac.za

COVID-19 online info session 20 April 2020 RTW

Coughing 0-3500 droplets

• CLEANING

Removal of dirt and impurities from objects

using water with detergents or soap but DOES

NOT kill the virus

• DECONTAMINATION

Use of chemicals to KILL the virus after cleaning

CLEANING versus DECONTAMINATION2

• Use of CORRECT disinfectants is important

• prevent the spread of disease

• Disinfectants may NOT work on all surfaces

• Porous – carpets, bedding, clothing

• Semi-porous – wood , dry wall, hardwood floor

• Non-porous – some tiles & counter tops, metal, glass

• Some disinfectants can be toxic and expensive

INTRODUCTION 3

The World Health Organization (WHO) and Centers

for Disease Control and Prevention (CDC)

recommend that appropriate disinfectants with

proven activity against enveloped viruses be used

to minimize the risk of transmission for COVID-19

• Hypochlorite (bleach or jik)

• Alcohol (~60%)

• Hydrogen peroxide

• Phenolic compounds

• Quaternary ammonium compounds (QAC)

4RECOMMENDED ACTIVE INGREDIENTS

• SURFACE - liquids, powders

• Disinfect frequently touched surfaces regularly

• Shared: equipment, door handles, toilet seats

• Personal : desks, phones, bed rails, i-pads

• HANDS – antimicro. soaps, liquids, gels, wipes

• Clean hands at the door and regular intervals

• Sanitizers must be allowed to dry (no rinse-gel)

• Use proper hand wash techniques (e.g. WHO)

TYPES OF DISINFECTANTS5

• Concentration and volume (e.g.1:4; 99,9%, 2ml)

• Ingredients and application

• Storage e.g. ↑Temperature ↑germicidal activity

• RH influence activity of gaseous disinfectants

• pH: ↑antimicrobial activity of QAC and ↓ phenols

• Contact time (e.g. 10min. 5min, 1min)

• Compliance standard (e.g. EN, SANS, ISO)

EFFECTIVENESS OF DISINFECTANTS 6

• Safety considerations includes:

•Material Data Safety Sheets (MSDSs)

•Product label and instructions

•Wash hands after use and moisturise hands

•Increase air circulation (open windows and fan)

•Users should be trained and provided with PPE

•Employee must report potential exposure ASAP

SAFE USE OF CLEANING AGENTS & DISNFECTANTS 7

LIST OF EPA APPROVED DISINFECTANTS

Last updated 16/04/2020

8

Examples of Products 9

Antiviral? Not interchangeable

Undiluted

One pump=~3ml

1 min contact time

No Expiry date

NO % Alcohol

Expiry date (2 yrs)

>70% Alcohol

Kills 99.999% bacteria

MSDS 10

DEEP CLEANING 11

Is it mist or gas?

Consider porous and semi-porous

surfaces (wood, dry wall)

Contractor must provide viral

efficacy report and procedure

CDC -24 h waiting before cleaning &

disinfection, Close off areas and

adequately ventilate the area

• Review company risk assessment for COVID-19• existing versus additional controls

• ensure adequate supply of wash basins, cleaning materials and disinfectants for healthy hygiene practices

• Hand sanitizers: accessible at critical areas (no water)

• Dedicated PPE :manufacturer guide (extra pairs reusable gloves)

• Update your policies, SOPs and work instructions• Procurement (contractors and samples), controls, application,

PPE, spills, safe disposal, training, risks

• Staff training and health promotion campaigns

• Identify the hotspots & prioritize high risk areas

WHERE TO FROM HERE? 12

• WHO

• CDC

• EPA

• NIOH

• NICD/NHLS

• NPIC

• FDA

• WWW.GOV.UK

Thank You

RECOMMENDED SITES 13